Some koans I've found helpful for thinking like Einstein (towards grand unifying theories and annus mirabilis representation cascades). Adapt them to your situation.
3D visualization is O(n) better than verbal reasoning since you can think in parallel threads and feedback loops. When swimming, to work on problems and count laps at the same time, I visualize an abacus. One of the threads moves slowly down based on the laps, and the other thread is free to explore the problems I've preloaded before the workout.
As Einstein once wrote to Hadamard, "(A) The words or the language, as they are written or spoken, do not seem to play any role in my mechanism of thought. The psychical entities which seem to serve as elements in thought are certain signs and more or less clear images which can be “voluntarily” reproduced and combined. There is, of course, a certain connection between those elements and relevant logical concepts. It is also clear that the desire to arrive finally at logically connected concepts is the emotional basis of this rather vague play with the above-mentioned elements. But taken from a psychological viewpoint, this combinatory play seems to be the essential feature in productive thought — before there is any connection with logical construction in words or other kinds of signs which can be communicated to others."